One of Canada’s largest battery storage facilities has officially entered commercial operation in eastern Ontario, marking a major milestone in the province’s efforts to modernize its electricity grid and prepare for rising power demand.
The Napanee Battery Energy Storage System, a 250-megawatt facility valued at roughly $600 million, is now capable of supplying electricity to as many as 250,000 homes for up to four hours during peak demand periods. The project was procured through the Independent Electricity System Operator’s Expedited Long-Term 1 process launched in 2022, which Ontario officials have described as the largest battery storage procurement initiative in Canadian history.
Ontario’s Energy Minister Stephen Lecce said the project arrives at a critical time for the province’s electricity system as demand continues to climb alongside population growth, industrial expansion and electrification.
Growing Demand Driving Storage Investments
Ontario forecasts electricity demand could increase by as much as 90 percent by 2050, placing additional pressure on the grid during high-demand periods and extreme weather events. Battery storage projects are increasingly viewed as a way to stabilize supply by storing excess electricity during low-demand hours and releasing it when consumption spikes.
The Napanee facility includes 284 battery storage units along with transformer stations and transmission infrastructure. It is designed to capture electricity generated during off-peak periods, including power from Ontario’s nuclear fleet, before dispatching it back into the system when needed.
Construction of the project supported about 120 jobs across engineering, skilled trades, manufacturing and transportation, while the completed site is expected to maintain ongoing operational and technical employment in the region. The project also incorporated Canadian supply chain participation, including medium-voltage transformers manufactured by Stein Industries and procured through Nbisiing Power.
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Battery Storage Expanding Across Canada
The Napanee project reflects a broader national push towards battery energy storage as provinces work to balance renewable generation, electrification and grid reliability.
Across Canada, utilities and governments are accelerating investments in battery storage to complement wind, solar and hydroelectric infrastructure. Alberta has emerged as a leading market for utility-scale battery projects tied to renewable energy development, while British Columbia and Nova Scotia are also expanding storage capacity to strengthen grid resilience and reduce reliance on fossil fuel peaker plants.
Industry groups say storage systems are becoming essential infrastructure as Canada moves toward a lower-carbon electricity system.
Vittoria Bellissimo, president and CEO of the Canadian Renewable Energy Association, described energy storage as a critical tool for maintaining reliability while integrating more intermittent renewable generation into provincial grids.
Ontario officials say projects such as Napanee, alongside nuclear refurbishments and hydroelectric expansion, are central to the province’s long-term energy strategy aimed at supporting economic growth while maintaining grid stability and affordability.
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